Hand-book of physiology (1892) (14785217523)

Identifier: handbookofphysio00bake (find matches)

Title: Hand-book of physiology

Year: 1892 (1890s)

Authors: Baker, W. Morrant, (William Morrant), 1839-1896 Harris, Vincent Dormer Kirkes, William Senhouse, 1823-1864. Hand-book of physiology. 13th ed

Subjects: Physiology Human physiology

Publisher: London : John Murray

Contributing Library: Francis A. Countway Library of Medicine

Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

Text Appearing Before Image:

—(i.) a group of large cells close to the tip of theinner part of the anterior cornu—all the cells of the anteriorcornu in the dorsal or thoracic region are said to belong to thisgroup • (ii.) several lateral groups (2, a, b, and c, fig. 353) on theouter side of the grey matter, and (iii.) a certain number of cellsat the base of the inner part of the anterior cornu particularlywell marked in the thoracic region. (6) Cells of the posteriorcornu—these are not numerous; they are small and branched, and 582 THE NEKVOUS SYSTEM. (CH. XVI. each probably has an axis-cylinder process passing off; but theseprocesses do not pass into the posterior nerve-roots. The groupsare two at least in number, viz., (i.) in connection with the edge ofthe grey matter externally, where it is considerably broken upby the passage of bundles of fibres through it, and called thelateral reticular formation ; and (ii.) in connection with a similarreticular formation, more at the tip of the grey matter of the

Text Appearing After Image:

Tig. 353.—Section of spinal cord, one half of -which (left) shows the tracts of the whitematter, and the other half (right) shows the position of the nerve cells in the greymatter. 7, 10, 9 and 3 are tracts of descending degeneration, 1, 4, 6 and 8, ofascending degeneration. Semidiagrammatic. (After Sherrington.) posterior cornu; this is known as the posterior reticularformation. The other groups of cells (not represented in fig. 353) arealmost, if not entirely, confined to the thoracic region of the cord,and are two in number, viz. : one situated at the base of theposterior cornu, formed of fairly large cells, generally fusiform,and possibly of two distinct kinds, constitutes the posteriorvesicular column of Lockhart Clarke, and the other situated onthe outer portion of the grey matter, about midway between theanterior and posterior cornua, constitutes the cells of the tractusintermedio-lateralis or lateral grey column. These cells are smalland spindle-shaped, and are more or less

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1892

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